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On a Thinkpad x61s, I noticed some memory corruption when plugging/unplugging the external VGA connection. The symptoms are that 4 bytes at the beginning of a page get overwritten by zeroes. The address of the corruption varies when rebooting the machine, but stays constant while it's running (so it's possible to repeatedly write some data and then corrupt it again by plugging the cable). Further investigation revealed that the corrupted address is (dev_priv->status_page_dmah->busaddr & 0xffffffff), ie. the beginning of the hardware status page of the i965 graphics card, cut to 32 bits. So it seems that for some memory access, the hardware uses only 32 bit addressing. If the hardware status page is located >4GB, this corrupts unrelated memory. Signed-off-by: Jan Niehusmann <jan@gondor.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: stable@kernel.org |
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